GT-234-02 9
CHECKS AND MAINTENANCE
WARNING!
Maintenance should be carried out only by qualified, skilled personnel.
It is recommanded that the safety slam shut-off valve be periodicly checked in order to ensure its proper
functioning. The frequency of inspection/checks and replacement depends upon severity of service
conditions and upon applicable standards and regulations. Safety slam shut-off valve and its pressure
accessories are subjected to wear and must be inspected periodicly and replaced as necessary. Before
carrying out maintenance, be sure that no gas under pressure is trapped in the safety slam shut-off valve..
First close inlet and outlet valve and then release gas from the line by opening the vent line.
Maintenance operations do not require removal the body from the line.
When carrying out maintenance procedures, replace all rubber parts.
Safety slam shut-off valve drawing and specifications are required to start with maintenance.
Checking safety slam shut-off valve
Proper operation can be tested by letting gas in at a pressure higher than set. Safety shut-off device must
activate and close the valve.
If you have the same problem again, slowly close inlet valve and call service personel from GasTeh to
carry out general maintenance of safety shut-off device.
General maintenance
General maintenance of safety slam shut-off valve is possible in following order (see safety slam shut-off
valve drawing - Picture 2):
- remove screws (7) and washers (8)
- separate safety shut-off device (6) and check O-ring (9)
- remove screws (7) and washers (8)
- remove body flange (3), check O-ring (9),remove and check nozzle (2), check O-ring (10)
- check all seal from removed parts
General maintenance of safety shut-off device is possible in following order (see safety shut-off
device drawing for dimension DN25 to DN50/
za dimenzije DN25 do DN50
- Picture 3.):
(set range 1-10 bar)
- safety shut-off device is previously disassembled from regulator body
- remove the screws (10), check the pad unit (1) and replace as necessary
- unscrew rod thorn (8), remove the spring support (6) and remove the spring (32)
- remove cover (29), unscrew adjusting ring (21) and (22), and remove springs (35) and (36)
- remove the screws (42), remove flange SSV (4) and the inlet guide (5).
- remove the screws (42), remove upper housing (26)
- remove membrane assembly, check membrane (25)
- remove screw (45) and remove subassembly I
- unscrew outlet guide carrier (12) and remove outlet guide (3)
-
remove the screws (44) and remove outlet guide carrier (11)
-
remove retainer ring (30) and remove rod guide (17)
- remove rod (2)
- check gaskets and sealing surfaces on all disassembled parts
